<template>
  <div class="upload-image-com">
    <el-upload
      ref="upload"
      multiple
      action=""
      :http-request="handleUpload"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="[{ hide: fileList.length >= limit }]"
      :disabled="disabled"
    >
      <i class="el-icon-plus" />
    </el-upload>
    <!-- 上传提示 -->
    <div v-if="showTip" slot="tip" class="el-upload__tip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的图片{{ sizeTips }}
    </div>
    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        v-imgError
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      >
    </el-dialog>
  </div>
</template>

<script>
import OSS from 'ali-oss'
import { fetchOSSInfo } from '@/api/common/index'
export default {
  model: {
    prop: 'value',
    event: 'input'
  },
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 1
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 1.5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg']
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: () => true
    },
    sizeTips: {
      type: String,
      default: () => ''
    },
    unloadCoverStyle: {
      type: Object,
      default: () => {}
    },
    disabled: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: '',
      dialogVisible: false,
      hideUpload: false,
      fileList: [],
      oss: null
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',')
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            item = { name: item, url: item }
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  created() {
    this.initOSS()
  },
  methods: {
    async initOSS() {
      const res = await fetchOSSInfo()
      if (res) {
        const { accessKey, accessSecret, bucket, endpoint } = res.data
        this.oss = new OSS({
          // 阿里云oss相关信息
          region: endpoint.split('.')[0],
          accessKeyId: accessKey,
          accessKeySecret: accessSecret,
          bucket: bucket
        })
      }
    },
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        this.$emit('input', this.listToString(this.fileList))
      }
    },
    // 上传成功回调
    handleUploadSuccess(fileUrl, file) {
      this.$refs.upload.clearFiles()
      this.$modal.closeLoading()
      // 如果上传成功
      this.uploadList.push({ name: file.name, url: fileUrl })
      this.number++
      console.log('this.uploadList>>>', this.uploadList, this.number)
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList)
        this.uploadList = []
        this.number = 0
        this.$emit('input', this.listToString(this.fileList))
      }
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join('/')}图片格式文件!`
        )
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.$modal.loading('正在上传图片，请稍候...')
      return true
    },
    handleUpload(option) {
      const { file } = option
      const randomName = this.getFileNameUUID()
      const key = 'datarOSS/' + randomName + file.name // 设置上传路径
      const ossOptions = {
        headers: {
          'Content-Type': file.type,
          'Content-Disposition': 'inline'
        }
      }
      this.oss
        .put(key, file, ossOptions)
        .then((result) => {
          console.log('result>>', result)
          this.handleUploadSuccess(result.url, file)
        })
        .catch((error) => {
          // 上传失败的操作
          console.log('上传失败', error)
          this.handleUploadError()
        })
    },
    getFileNameUUID() {
      function rx() {
        return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1)
      }
      return `${+new Date()}_${rx()}${rx()}`
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError('上传图片失败，请重试')
      this.$modal.closeLoading()
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = ''
      separator = separator || ','
      for (const i in list) {
        strs += list[i].url + separator
      }
      return strs !== '' ? strs.substr(0, strs.length - 1) : ''
    }
  }
}
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>

<style lang="scss" scoped>
.upload-image-com .el-upload {
  width: 100%;
}
</style>
